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The next richest seafood sources are silver and king salmon, sardines, and mackerel (230 to 350 IUs per 3.5 oz serving).

So, while fatty fish offer more vitamin D3 than any other foods, even folks who enjoy them frequently need supplemental amounts to reliably ensure that they get the 1,000 IUs per day that experts recommend.

*The glycerol in the glycerin that’s used in our softgels as part of the gelatin compound is derived entirely from vegetable sources, contains no animal products and does not come in contact with any animal-derived products until it meets the fish gelatin in the process of making our capsules.

Most experts say that the evidence supports a daily intake of at least 1,000 IU via food and supplements, and most prefer an intake of 2,000 IU to 4,000 IU per day*.

This intake level applies to all people, but is especially advised for darker skinned people who spend less than 30 minutes per day in strong sunlight. Darker skinned people, whose greater amount of skin pigment blocks the UV rays that make vitamin D, need more sun exposure*.

The official upper intake limit is now 2,000 IU per day. However, vitamin D intake is proven safe* at a daily intake level of 10,000 IU ... which is 25 times the current RDA for adults 51 or older (400 IU).